Exercise is an increasingly popular activity that has widespread and important implications for cardiovascular health and disease. Correspondingly, medical library shelves are filled with books detailing the relation between exercise and the heart. Some of these books are epidemiologically oriented (examining exercise as a cardiac risk-modifier, for example), some focus on exercise as a diagnostic tool (as in stress testing), and some center on exercise as a therapeutic tool (as in cardiac rehabilitation). Most exercise books touch generally on all of these areas but...